Former boxing champion Mike Tyson has been forced to scrap a series of press appearances in London after U.K. immigration officials banned him from entering the country due to his 1990s rape conviction. The retired sportsman-turned-actor was due to promote his new autobiography, Undisputed Truth, in the city this week (beg09Dec13), but a change in British immigration laws means anyone who has been sentenced to more than four years in prison is barred from entry. Tyson served half of a six-year sentence for the 1992 conviction. As a result, The Hangover star has instead headed to Paris, France to salvage the European promotional trip, which was expected to include a London book signing and a question-and-answer session with fans in a boxing ring. A spokesman for the book's publishers HarperCollins says, "There was a change in the U.K. immigration law in December 2012 of which we were unaware." Tyson, who also has previous convictions for assault, cocaine possession and driving under the influence, has yet to comment on the change of plans. Meanwhile, the immigration change has also put his 2014 U.K. stage production of his one-man show, Mike Tyson: Undisputed Truth, in jeopardy - the sports icon, 47, was due to begin a touring production of his Broadway hit in March (14). Producers and director Spike Lee have yet to issue a statement about how the law will affect their plans.